Mash Tl 4 Crash Testing And Evaluation Of The Restore Barrier

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Mash Tl 4 Crash Testing And Evaluation Of The Restore Barrier

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Author : Jennifer D. Schmidt
language : en
Publisher:
Release Date : 2015

Mash Tl 4 Crash Testing And Evaluation Of The Restore Barrier written by Jennifer D. Schmidt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Median strips categories.

"Three full-scale vehicle crash tests were conducted according to the MASH Test Level 4 (TL-4) safety performance criteria on a restorable and reusable energy-absorbing roadside/median barrier, designated the RESTORE barrier. The system utilized for test nos. SFH-1 through SFH-3 was 240 ft (73.2 m) long with a nominal height of 38 5/8 in. (981 mm). The barrier consisted of an upper steel tube rail attached to top of the 20-ft (6.1-m) long x 22 1/4-in. (565-mm) wide precast concrete beams connected with wedge-shaped joints and supported by 11 5/8-in. (295-mm) tall rubber posts and steel skids" (page i).

Roadside Design Guide

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Author : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
language : en
Publisher: AASHTO
Release Date : 2011

Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and has been published by AASHTO this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Technology & Engineering categories.

"The Roadside Design Guide presents a synthesis of current information and operating practices related to roadside safety and is written in dual units-metric and U.S. Customary. This book is a guide. It is not a standard, nor is it a design policy. It is intended to use as a resource document from which individual highway agencies can develop standards and policies. Although much of the material in the guide can be considered universal in its application, several recommendations are subjective in nature and may need modification to fit local conditions. However, it is important that significant deviations from the guide be based on operational experience and objective analysis. The 2011 edition of the AASHTO Roadside Design Guide has been updated to include hardware that has met the evaluation criteria contained in the National Cooperative Highway Research Program (NCHRP) Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features and begins to detail the most current evaluation criteria contained under the Manual for Assessing Safety Hardware, 2009 (MASH). For the most part, roadside hardware tested and accepted under older guidelines that are no longer applicable has not been excluded in this edition." -- AASHTO website.

Develop Guidelines For Inspection Repair And Use Of Portable Concrete Barriers

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Author : Chiara Silvestri Dobrovolny
language : en
Publisher:
Release Date : 2022

Develop Guidelines For Inspection Repair And Use Of Portable Concrete Barriers written by Chiara Silvestri Dobrovolny and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Concrete categories.

The purpose of the tests reported herein was to assess the performance of the damaged portable concrete barrier according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH), Second Edition. The crash tests were performed in accordance with MASH Test 3-11, which involves a 2270P vehicle weighing 5000 lb impacting the longitudinal barrier while traveling at 62 mi/h and 25 degrees. This report provides details on the damaged portable concrete barriers, the crash tests and results, and the performance assessment of the damaged portable concrete barriers for MASH Test Level 3 (TL-3) longitudinal barrier evaluation criteria. The damaged portable concrete barriers met the performance criteria for MASH TL-3 longitudinal barriers.

Tl 4 Crash Test And Evaluation Of Free Standing Single Slope Concrete Barrier With Cross Bolt Connection

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Author : Nauman Mansoor Sheikh
language : en
Publisher:
Release Date : 2019

Tl 4 Crash Test And Evaluation Of Free Standing Single Slope Concrete Barrier With Cross Bolt Connection written by Nauman Mansoor Sheikh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Automobiles categories.

The purpose of the testing reported herein was to assess the performance of the free-standing single slope concrete barrier (SSCB) with cross-bolt connections according to the safety-performance evaluation guidelines included in American Association of State Highway and Transportation Officials' Manual for Assessing Safety Hardware (MASH) for Test Level Four (TL-4). The crash test performed was in accordance with MASH Test 4-12 criteria, which involves a 10000S single unit truck impacting the barrier at a target impact speed and angle of 56 mi/h and 15°, respectively. The free-standing SSCB with cross-bolt connection successfully contained and redirected the single unit truck. The barrier performed acceptably for MASH Test 4-12. The maximum dynamic and permanent barrier deflections were each 33.0 inches. In addition to the TL-4 crash test, researchers performed a detailed finite element analysis to determine the expected lateral deflection of the barrier under MASH Test 4-11 conditions, which involve impacting the barrier with a 2270P pickup truck vehicle with a target impact speed and angle of 62 mi/h and 25°, respectively. The maximum lateral barrier deflection for the pickup truck impact was estimated to be in the range of 12.5 inches to 16.8 inches.

Mash Tl 3 Evaluation Of Guardrail To Rigid Barrier Transition Attached To Bridge Or Culvert Structure

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Author : William F. Williams (Transportation engineer)
language : en
Publisher:
Release Date : 2020

Mash Tl 3 Evaluation Of Guardrail To Rigid Barrier Transition Attached To Bridge Or Culvert Structure written by William F. Williams (Transportation engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Automobiles categories.

Texas Transportation Institute (TTI) researchers performed an extensive literature review of bridge railing transitions crash tested to Manual for Assessing Safety Hardware (MASH) TL-3, and incorporated the information obtained from this review into the design and details for the new transition testing developed for this project. TTI researchers developed concepts for the new transition anchored to a concrete wing wall. TTI researchers developed a full-scale, three-dimensional finite element model of the guardrail transition. The modeling effort included developing and validating a subcomponent level model of the post installed on concrete. Upon completion of the simulations, TTI researchers processed the results and assessed the likelihood of the transition system passing the required MASH crash tests. TTI researchers noted the design deficiencies and recommended design modifications to the system to mitigate those deficiencies. TTI researchers developed full-scale test installation drawings of the design after the finite element model simulations were completed and all the results were reviewed with favorable results. After approval of the test installation drawings by Texas Department of Transportation (TxDOT), construction of a full-scale test installation for crash testing commenced, and crash tests were performed on the full-scale test installation. The Guardrail to Rigid Barrier Transition Attached to Bridge or Culvert Structure, used on the upstream and downstream ends, performed acceptably for MASH TL-3 transitions.

Development And Evaluation Of Mash Tl 4 Guardrail System

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Author : Nauman Mansoor Sheikh
language : en
Publisher:
Release Date : 2021

Development And Evaluation Of Mash Tl 4 Guardrail System written by Nauman Mansoor Sheikh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Automobiles categories.

Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 4 (TL-4) compliant metal guardrail system. The researchers first developed several preliminary design concepts of the guardrail system, one of which was selected by the Texas Department of Transportation (TxDOT) for further development through simulation and crash testing. The researchers then developed a full-scale finite element model of the selected system and performed impact simulations under MASH TL-4 impact conditions. Using the results of these impact simulations, the researchers made further improvements to the guardrail design and developed the final system design details for crash testing. TTI then constructed the guardrail installation and performed MASH Test 4-12 with a single unit truck, MASH Test 4-11 with a pickup truck, and MASH Test 4-10 with a small car to meet MASH TL-4 compliance criteria for longitudinal barriers. This report provides details of the guardrail design development, the crash tests and results, and the performance assessment of the guardrail system for MASH TL-4 longitudinal barrier evaluation criteria. The design developed under this research project provides a MASH TL-4 compliant guardrail system that allows TxDOT to provide enhanced roadside safety in corridors that experience above-average heavy vehicle traffic.

Mash Tl 3 Transition Between Median Guardrail And Median Concrete Barrier

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Author : Akram Y. Abu-Odeh
language : en
Publisher:
Release Date : 2021

Mash Tl 3 Transition Between Median Guardrail And Median Concrete Barrier written by Akram Y. Abu-Odeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Automobiles categories.

The purpose of this research was to develop a Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) compliant transition between a median guardrail and median concrete barrier, and then test the design according to MASH TL-3 crash testing guidelines. The design was developed using finite element computer simulations. This report provides details on the computer simulations, the Texas Department of Transportation (TxDOT) median transition system, the crash tests and results, and the performance assessment of the median transition for MASH TL-3 transition evaluation criteria. The TxDOT median transition met the performance criteria for MASH TL-3 transitions.

Evaluation Of Adjustable Continuity Joint Variations For Use In The Restore Barrier

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Author : Scott K. Rosenbaugh
language : en
Publisher:
Release Date : 2017

Evaluation Of Adjustable Continuity Joint Variations For Use In The Restore Barrier written by Scott K. Rosenbaugh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Roads categories.

"During MASH TL-4 full-scale testing of the RESTORE barrier, concrete cracking and spalling was observed on the barrier beams that would likely require repairs or replacement. This study sought to evaluate joint design alternatives for use in the RESTORE barrier in order to limit the amount of system damage. Three variations of the adjustable continuity joint (ACJ) were identified as potential modifications: 1) incorporating rubber bearing pads within the ACJ, 2) utilizing normal weight concrete instead of lightweight concrete, and 3) incorporating a steel end cap into the ends of the beam segments. Four dynamic component tests were conducted to evaluate the performance of these three joint variations against the performance of the original, as-tested, RESTORE ACJ. All three modified designs showed improved durability over the original ACJ. The normal weight concrete beams delayed the onset of cracking and fracture, but ultimately had similar damage to that of he baseline test. The rubber pad reduced cracking and prevented fractures, but it increased the flexibility of the joint. Finally, the steel end caps allowed only small hairline cracks to form while also stiffening the joint. Although these component tests showed promise for the ACJ design variations, further evaluation and analysis is recommended prior to utilizing any of these joints in real-world barrier installations" (page. i).

Mash Tl 3 Evaluation Of The Unreinforced Single Slope Concrete Median Barrier

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Author : Robert W. Bielenberg
language : en
Publisher:
Release Date : 2018

Mash Tl 3 Evaluation Of The Unreinforced Single Slope Concrete Median Barrier written by Robert W. Bielenberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Roads categories.

The Ohio Department of Transportation (ODOT) requested an evaluation of an unreinforced, single-slope concrete median barrier capable of satisfying Test Level 3 (TL-3) safety requirements found in the Manual for Assessing Safety Hardware, Second Edition (MASH 2016). The barrier was designed with a height of 42 in. (1,067 mm), a base width of 28 in. (711 mm), and top width of 12 in. (305 mm). The tarmac surface was milled down 1 in. (25 mm) to accommodate the barrier and asphalt pad. The barrier was cast in place using concrete with a minimum compressive strength of 4,000 psi (27.6 MPa). Expansion joints were installed in 20-ft (6.1-m) intervals to simulate cracking and potential barrier discontinuities. An asphalt pad, installed on the milled surface using a tack coat, functioned as the barrier keyway and extended 96 in. (2,438 mm) from the traffic and back sides of the barrier. Previous testing of similar single-slope concrete barriers indicated that only one full-scale crash test (MASH test designation no. 3-11) was needed to satisfy TL-3 criteria. During the test, the 5,001-lb (2,268-kg) pickup impacted the installation at a speed of 62.8 mph (101.0 km/h) and at an angle of 24.9 degrees for an impact severity of 116.3 kip-ft (157.7 kJ). The vehicle was safely contained and redirected, and the test satisfied safety performance evaluation criteria of test designation no. 3-11 found in MASH 2016.

Mash Tl 3 Evaluation Of The Txdot Tl 3 Low Profile Barrier For High Speed Applications

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Author : Chiara Silvestri Dobrovolny
language : en
Publisher:
Release Date : 2018

Mash Tl 3 Evaluation Of The Txdot Tl 3 Low Profile Barrier For High Speed Applications written by Chiara Silvestri Dobrovolny and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Automobiles categories.

In response to the implementation requirements set forth by the Federal Highway Administration, the Texas Department of Transportation Bridge, Design, Maintenance, and Traffic Operations Divisions reviewed their standards for roadside safety devices and identified those devices that require testing and evaluation to assess MASH compliance. Under this phase of the project, the Low-Profile MASH Concrete Barrier (LPCB-13) was evaluated. The objective of this project was to design a TL-3 low-profile barrier for high speed applications and assess its performance according to the safety-performance evaluation guidelines included in MASH for Test Level 3 (TL-3) longitudinal barriers. Based on the detailed computer model simulations results, researchers performed MASH full-scale crash tests on a low-profile portable concrete barrier system comprised of 26-inch tall, 30-ft long barrier segments with a T-shape profile. Based on constructbility feedback, researchers modified the straight side of the barrier to a 1:18 slope, to allow for easiness of construction forming tje TL-3 Low -Profile Barrier performed acceptably as a MASH TL-3 longitudinal barrier.